I'm working on this English homework where I have to translate a text from my native language into English. There's one word that means "something that requires numerous attempts" or "something that requires retrying." I cannot say "trial and error" because the original text didn't really mention anything about errors. It is basically a sentence literally translated into something like " X requires retrying.". So my question is, is there a word to describe that? For example,
X is ___.
or
X requires ___ [something better than retrying].
trial and error
fits here. Yet, I'm confused by "I cannot say "trial and error" because the original text didn't really mention anything about errors.". Why would you need to retry something if its not necessary? That is, an error was not encountered? Sure, no explicit mention of "errors" were made, but those were implied considering you are retrying something that failed.